Memory write protection using timers

Details Memory write protection using timers Memory write protection using timers

1982-08-25

1985-01-08

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 700

Patent

active

044930313

ABSTRACT:
A memory write-enable circuit is disclosed which protects data stored in a random access memory (RAM) from erroneous write commands. The circuit is enabled, permitting write commands to RAM for a fixed time interval, only when two predetermined control signals occur within a prescribed time period. The circuit is disabled either by the elapse of the fixed time interval or by a clear signal.

REFERENCES:
patent: 4099243 (1978-07-01), Plaumbo
patent: 4154988 (1979-05-01), Fechalos
patent: 4332009 (1982-05-01), Gerson
Electronic Engineering, Feb. 1979, "Z-80 Memory Write Protect" p. 27, E. Baddiley.

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